scholarly journals Correlated, precision measurements ofθ23andδusing only the electron neutrino appearance experiments

2013 ◽  
Vol 87 (11) ◽  
Author(s):  
Hisakazu Minakata ◽  
Stephen J. Parke
Keyword(s):  
Electron Neutrino ◽  
Precision Measurements ◽  
Electron Neutrino Appearance

scholarly journals Results from the NOvA Experiment

2018 ◽  
Vol 46 ◽  
pp. 1860038 ◽  
Author(s):  
Erica Smith
Keyword(s):  
Electron Neutrino ◽  
Muon Neutrino ◽  
Precision Measurements ◽  
Neutrino Beam ◽  
Mass Hierarchy ◽  
Long Baseline ◽  
Neutrino Oscillation Experiment ◽  
Numi Beam ◽  
Electron Neutrino Appearance ◽  
Atmospheric Mass

The NOvA experiment is a long-baseline accelerator-based neutrino oscillation experiment. It uses the upgraded NuMI beam from Fermilab to measure electron-neutrino appearance and muon-neutrino disappearance between the Near Detector, located at Fermilab, and the Far Detector, located at Ash River, Minnesota. The NuMI beam has recently reached and surpassed the 700 kW power benchmark. NOvA’s primary physics goals include precision measurements of oscillation parameters, such as [Formula: see text] and the atmospheric mass-squared splitting, along with probes of the mass hierarchy and of the CP violating phase. This talk will present the latest NOvA results, based on a neutrino beam exposure equivalent to [Formula: see text] protons-on-target.

scholarly journals T2K and Beyond

2016 ◽  
Vol 2016 ◽  
pp. 1-17
Author(s):  
M. G. Catanesi
Keyword(s):  
State Of The Art ◽  
New Physics ◽  
Electron Neutrino ◽  
Muon Neutrino ◽  
Precision Measurements ◽  
Neutrino Beam ◽  
Mixing Angle ◽  
Long Baseline ◽  
Physics Potential ◽  
Electron Neutrino Appearance

This paper presents thestate of the artof the T2K experiment and the measurements prospects for the incoming years. After a brief description of the experiment, the most recent results will be illustrated. The observation of the electron neutrino appearance in a muon neutrino beam and the new high-precision measurements of the mixing angleθ13by the reactor experiments have led to a reevaluation of the expected sensitivity to the oscillation parameters, relative to what was given in the original T2K proposal. For this reason the new physics potential of T2K for7.8×1021p.o.t. and for data exposure 3 times larger than that expected to be reachable with accelerator and beam line upgrades in 2026 before the start of operation of the next generation of long-baseline neutrino oscillation experiments will also be described in the text. In particular the last challenging scenario opens the door to the possibility of obtaining, under some conditions, a 3σmeasurement excludingsin⁡(δCP)=0.

scholarly journals Latest Results from the T2K Neutrino Experiment

Universe ◽  
2019 ◽  
Vol 5 (1) ◽  
pp. 21
Author(s):  
Dean Karlen ◽  
on behalf of the TtwoK Collaboration
Keyword(s):  
Cp Violation ◽  
Neutrino Oscillation ◽  
Neutrino Mass ◽  
Electron Neutrino ◽  
Muon Neutrino ◽  
Neutrino Experiment ◽  
Long Baseline ◽  
Neutrino Oscillation Experiment ◽  
Electron Neutrino Appearance ◽  
Oscillation Experiment

The T2K long baseline neutrino oscillation experiment measures muon neutrino disappearance and electron neutrino appearance in accelerator-produced neutrino and anti-neutrino beams. This presentation reports on the analysis of our data from an exposure of 2 . 6 × 10 21 protons on target. Results for oscillation parameters, including the CP violation parameter and neutrino mass ordering, are shown.

scholarly journals Parallel Event Selection on HPC Systems

2019 ◽  
Vol 214 ◽  
pp. 04059
Author(s):  
Marc Paterno ◽  
Jim Kowalkowski ◽  
Saba Sehrish
Keyword(s):  
Neutrino Oscillation ◽  
Selection Criteria ◽  
High Performance ◽  
Electron Neutrino ◽  
Recent Measurement ◽  
Data Format ◽  
Event Selection ◽  
Full Dataset ◽  
Table Data ◽  
Electron Neutrino Appearance

In their recent measurement of the neutrino oscillation parameters, NOvA uses a sample of approximately 25 million reconstructed spills to search for electron-neutrino appearance events. These events are stored in an n-tuple format, in 250 thousand ROOT files. File sizes range from a few hundred KiB to a few MiB; the full dataset is approximately 1.4 TiB. These millions of events are reduced to a few tens of events by the application of strict event selection criteria, and then summarized by a handful of numbers each, which are used in the extraction of the neutrino oscillation parameters. The NOvA event selection code is currently a serial C++ program that reads these n-tuples. The current table data format and organization and the selection/ reduction processing involved provides us with an opportunity to explore alternate approaches to represent the data and implement the processing. We represent our n-tuple data in HDF5 format that is optimized for the HPC environment and which allows us to use the machine’s high-performance parallel I/O capabilities. We use MPI, numpy and h5py to implement our approach and compare the performance with the existing approach. We study the performance implications of using thousands of small files of different sizes as compared with one large file using HPC resources. This work has been done as part of the SciDAC project, “HEP analytics on HPC” in collaboration with the ASCR teams at ANL and LBNL.

scholarly journals First Measurement of Electron Neutrino Appearance in NOvA

2016 ◽  
Vol 116 (15) ◽  
Author(s):  
P. Adamson ◽  
C. Ader ◽  
M. Andrews ◽  
N. Anfimov ◽  
I. Anghel ◽  
...  
Keyword(s):  
Electron Neutrino ◽  
Electron Neutrino Appearance

scholarly journals Roles of sterile neutrinos in particle physics and cosmology

2019 ◽  
Vol 34 (10) ◽  
pp. 1930005 ◽  
Author(s):  
Sin Kyu Kang
Keyword(s):  
Dark Matter ◽  
Particle Physics ◽  
Sterile Neutrino ◽  
Electron Neutrino ◽  
Type I ◽  
Sterile Neutrinos ◽  
Short Baseline ◽  
Cosmological Observations ◽  
Cosmological Data ◽  
Electron Neutrino Appearance

The impacts of the light sterile neutrino hypothesis in particle physics and cosmology are reviewed. The observed short baseline neutrino anomalies challenging the standard explanation of neutrino oscillations within the framework of three active neutrinos are addressed. It is shown that they can be interpreted as the experimental hints pointing towards the existence of sterile neutrino at the eV scale. While the electron neutrino appearance and disappearance data are in favor of such a sterile neutrino, the muon disappearance data disfavor it, which gives rise to a strong appearance–disappearance tension. After a brief review on the cosmological effects of light sterile neutrinos, proposed signatures of light sterile neutrinos in the existing cosmological data are discussed. The keV-scale sterile neutrinos as possible dark matter candidates are also discussed by reviewing different mechanisms of how they can be produced in the early Universe and how their properties can be constrained by several cosmological observations. We give an overview of the possibility that keV-scale sterile neutrino can be a good DM candidate and play a key role in achieving low-scale leptogenesis simultaneously by introducing a model where an extra light sterile neutrino is added on top of type I seesaw model.

scholarly journals Long-Baseline Neutrino Oscillation Experiments

2013 ◽  
Vol 2013 ◽  
pp. 1-30 ◽  
Author(s):  
G. J. Feldman ◽  
J. Hartnell ◽  
T. Kobayashi
Keyword(s):  
Neutrino Oscillation ◽  
Electron Neutrino ◽  
Mass Hierarchy ◽  
Unknown Parameters ◽  
Long Baseline ◽  
Oscillatory Pattern ◽  
Oscillation Phenomenon ◽  
The Standard Model ◽  
Good Energy ◽  
Electron Neutrino Appearance

A review of accelerator long-baseline neutrino oscillation experiments is provided, including all experiments performed to date and the projected sensitivity of those currently in progress. Accelerator experiments have played a crucial role in the confirmation of the neutrino oscillation phenomenon and in precision measurements of the parameters. With a fixed baseline and detectors providing good energy resolution, precise measurements of the ratio of distance/energy (L/E) on the scale of individual events have been made and the expected oscillatory pattern resolved. Evidence for electron neutrino appearance has recently been obtained, opening a door for determining the CP violating phase as well as resolving the mass hierarchy and the octant ofθ23; some of the last unknown parameters of the standard model extended to include neutrino mass.

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